Add room invite command, refactor trimming #room and @user strings.
Add room invite command, refactor trimming #room and @user strings.

katopz/nullchat,praneybehl/nullchat,coreyaus/nullchat,katopz/nullchat,mattfeldman/nullchat,praneybehl/nullchat,mattfeldman/nullchat,coreyaus/nullchat